This battery looks identical to my Swift 40v battery. Do you know if they are compatible?

I'm afraid it is NOT compatible. Each OEM tends to make a form-factor unique to it's range of tools (no surprise there!!)

Does this fit the Qualcast lawnmower?

Only green. Works appliances of the same voltage and ah

How long to charge at first?

Hi Gary, not too long. About 1 - 2 hours. When you're mowing/strimming etc., and you exhaust the battery, it will be quite warm and won't charge until it has cooled down (generally after about 30 mins). Hope this helps

When battery is fitted to charger both lights immediately go out, with no battery in place charger power light stays on what needs replacing ?

Under normal conditions, a flashing LED indicates that the battery is faulty - remove for 1 minute, unplug the charger and retry. If LED still flashes, replace the battery. If both lights go out, the battery is less than 10% charged - leave it in the charger and check the progress by pressing the BCI button. If the BCI remains unlit, then replace the battery.

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Greenworks 40V Battery. Original Greenworks 4Ah Powerful Lithium-Ion Battery for All Greenworks 40V Garden and Power Tools. Fast Charging, 3-Stage Level Control. 2 Year Warranty G40B4

Greenworks 40V Battery. Original Greenworks 4Ah Powerful Lithium-Ion Battery for All Greenworks 40V Garden and Power Tools. Fast Charging, 3-Stage Level Control. 2 Year Warranty G40B4

Product ID: 162550355

Details

Battery capacity
4
Battery cell composition
Lithium Ion
Brand
Greenworks
Number of batteries
1 Lithium Ion
Recommended uses for product
Herramienta

⚡40V high-voltage power

💡LED charge status display

🔋4Ah long-lasting capacity

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Description

⚡ Power your garden hustle with Greenworks 40V — never get caught powerless again!

RAPID RECHARGE READY - Fast charging capability means less downtime—get back to work in under 30 minutes with compatible chargers.
UNIVERSAL COMPATIBILITY - Seamlessly swap batteries across the entire Greenworks 40V lineup—one battery, endless possibilities.
DURABLE COMPACT DESIGN - Robust casing with deep discharge protection ensures longevity and comfort, built to withstand your busiest days.
UNMATCHED POWER RUNTIME - 40V lithium-ion tech delivers peak performance for all Greenworks tools, powering through your toughest garden tasks.
SMART LED CHARGE INDICATOR - Instantly know your battery’s status with a sleek multistage LED display—no more guessing, just go.

The Greenworks 40V 4Ah Lithium-Ion Battery is a high-performance, fast-charging power source designed for all Greenworks 40V cordless garden and workshop tools. Featuring a durable casing, integrated deep discharge protection, and a multistage LED charge indicator, it offers reliable, long-lasting energy with no memory effect. Compatible across the Greenworks 40V range, this battery ensures maximum efficiency and convenience for professional-grade outdoor work.

Specifications

ASIN	B07S38BDL8
Amperage	4 Amps
Antenna Location	Herramienta eléctrica
Battery Capacity	4
Battery Cell Type	Lithium Ion
Battery Weight	1.25 Kilograms
Best Sellers Rank	12,580 in DIY & Tools ( See Top 100 in DIY & Tools ) 46 in Cordless Tool Battery Packs
Box Contents	40V 4Ah battery
Brand Name	Greenworks
Compatible Phone Models	Not for mobiles
Country of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (274)
Global Trade Identification Number	06952909053172
Item Dimensions	10.2 x 9.5 x 18 centimetres
Item Type Name	Battery
Item Weight	1.25 Kilograms
Manufacturer	Greenworks
Model Name	G40B4
Model Number	01-000002927007
Number of Batteries	1 Lithium Ion batteries required. (included)
Reusability	Rechargeable
Unit Count	1.0 count
Voltage	40 Volts

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€ 379.27

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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